Solving indefinite integral: ∫ DT / (t-1) ^ 2 solving process

Solving indefinite integral: ∫ DT / (t-1) ^ 2 solving process

∫ dt/(t-1)² dt
= ∫ d(t-1)/(t-1)² dt
= (t-1)^(-2+1) / (-2+1) + C
= -(t-1)^(-1) + C
= 1/(1-t) + C